Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Income Statement [Abstract]
Net sales	$ 1,444,497	$ 1,311,291	$ 1,213,699
Cost of sales	547,150	501,131	472,948
Gross profit	897,347	810,160	740,751
Operating expenses:
Sales and marketing	650,357	595,845	550,475
General and administrative	127,269	109,674	99,209
Research and development	27,806	27,991	15,971
Total operating expenses	805,432	733,510	665,655
Operating income	91,915	76,650	75,096
Other (expense) income, net	(877)	(717)	334
Income before income taxes	91,038	75,933	75,430
Income tax expense	25,961	24,516	24,911
Net income	$ 65,077	$ 51,417	$ 50,519
Basic net income per share:
Net income per share – basic	$ 1.58	$ 1.11	$ 0.99
Weighted-average shares – basic	41,212,000	46,154,000	51,252,000
Diluted net income per share:
Net income per share – diluted	$ 1.55	$ 1.10	$ 0.97
Weighted-average shares – diluted	42,085,000	46,902,000	52,101,000